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So I got myself a nice Tarmac SL frame and I plan to install 9100 crankset in it. What's the best adapter to make it possible? I would like to use the ceramicspeed bearings that are already installed in the frame. I've heard some positive opinions on the wheels mfg adapter. Is it the right way to go?

Those adaptors should be all you need, however it's not the best solution, a lot of people complain about creaking while using the adaptors. I would suggest looking at the wheels mfg BB, there is a ceramic option. The screw together set up and lack of adaptors should make for a painless creak free set up.